Mining-machine



' (No Model.) `2 Sheets-Sheet 1.

H. B. WYMAN. MINING MACHINE.

No. 454,895. Patented June 30, 1891.

INVEN'l'QR:

WITNESSES:

A TYS.

(No Model.) g2 hens-sneenz.

' H. B. WYMAN. MINING MACHINE.

No. 454,895. Patented June 30, 1891.

INVENTR:

wlTNEssE's:

UNITED STATES HORACE B. XVYMAN, OF BYFIELD, MASSACHUSETTS, ASSIGNOR TO PATENT OFFICE.

THE

MININGMACHINE.

SPECIFICATION forming part of Letters Patent No. 454,895, dated J une 30, 1891.

Application filed August 1, 189D. SerialNo. 360,660-x (No model.)

To all whom it may concern.'

Be it known that l, HORACE B. WYMAN, a

y citizen of the United States, residing at Bysurface of the drift as possible, and a cross-` bar iixed upon the frame has been used to support the front ends of the cutter-bars and anger-shafts. These have passed through the center of the cross-bar, leaving a portion of the latter extending down low, where it strikes against the cuttings which collect in front of the machine and prevent its being fed forward as the cutis made. To overcome this difficulty I have devised a machine in which the crss-bar is so shaped as to pass above the cutting apparatus, and has bear" ings upon its under side by which the cutter-bars and shafts are suspended from the bar. The cross-baralso moves forward freely upon t-he machine with the cutting apparatus as the cut is made.

My improvements are illustrated in the accompanying drawings, wherein- Figure l is a plan view showing the front end of the machine. Fig. 2 is a front view showing certain of the auger-shafts and bearings in section. Fig. 3 is a detail view of a portion of the cross-bar, and Fig. 4 is a longi-` tudinal sectional View of the auger-shaft and bearing upon an enlarged scale.

The frame of the machine, with the exception of the cross-bar hereinafter referred to, is the same as in others of this general type, and is shown in part at A, together with the screw-threaded standards B B, which furnish .means for vertical adjustment.

The cutting apparatus consists of a series of angers C, each mounted upon the outer end of anauger-shaft D, and a similar set of cutter-bars F, carrying chisels F', all,r arranged in a straight line from side to side of the machine, the chisels alternating with the angers.

From the frame A depend hangers G G', upon which are jonrnaled grooved rollers H H', between and by which is supported the cross-bar Idesigned to furnish bearings for the front ends of the-cutting apparatus. This cross-bar is placed close to the drill ends of the cutter-bars, and is similar to one such as is now used with the'lower half cnt away; or it may be otherwise so shaped as to pass above the auger-shafts and cutter-bars, the important thing being that a clear space is left below it, so that forward movement be not impeded by the bar striking against the loose cuttings which collect in front of it. The bar is grooved on its under side, as shown at J, and fitting these grooves are tubes L, brazed or welded to it. Each of these tubes forms a bearing for one of the auger-shafts, which are made somewhat smaller than the internal diameter of the tube to leave an intermediate oil-space a, and the two outer grooves of the rollers H H. the pipes are bearings for the cutter-bars, which are shown as consisting of T-shaped slits O, through which pass the correspondingly-shaped bars. The shafts have sockets P to receive the angers and revolve freely in the tubes L. As the cut is formed, the cnttingapparatus, cross-bars, and tubes attached thereto are fed forward all together, instead of advancing the tubes through the bar, as has heretofore been the custom.

What I claim as new, and desire to secure by Letters Patent, is-

l'. rlhe combination, in a mining-machine, of the cross-bar having bearings brazed or welded to its under side, with the cutting ported by said bearings, as described.

2. The combination, in a mining-machine, of the cross-bar, groovedas shown, with pipes fitting said grooves brazed or welded to the bar, and the augershafts journaled in'said tubes, as described.

apparatus below the said cross-bar and suptubes support the bar by taking into the Midwaybetween IOO e Y n 454,895

3. The combination, in a mining-machine, rakingl into grooved rollers on the frame of o of the auger-shafts and cutter-bars, With the the machine and free to slide lengthwise cross-bar placed close to the drill ends of the thereof, with the cutting apparatus, having cutter-bars and having bearings in which the their front ends Sustained by said bar, as de 5 said bars slide, and the tubesbrazed or welded scribed.

to the bottoni 0f the cross-bar and forming HORACE B. VYMN. bearings for the auger-shafts, as described. Witnesses:

4. The combination, in n mining-machine, F. E. GARSIDE,

of the cross-bar having a pipe at each end E. L. YOUNG. 

